下面各题写出必要的计算过程,能简便计算的要简便计算.
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(1)[4/15]×75,

=[4/15]×(15×5),

=([4/15]×15)×5,

=4×5,

=20;

(2)[7/18]×[9/14]=[1/4];

(3)[9/14]×21×[2/9],

=[27/2]×[2/9],

=3;

(4)[11/14]×[7/10]×[8/33],

=[11/20]×[8/33],

=[2/15];

(5)[3/4]×[2/5]+[3/5]×[3/4],

=[3/4]×([2/5]+[3/5]),

=[3/4];

(6)[4/5]×[5/8]+[5/12]×[4/5],

=[1/2]+[1/3],

=

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